Ledgebrook has raised $200 million in primary equity financing co-led by Allianz X and Rockefeller Capital Management to scale its AI-native specialty insurance platform. Existing and new investors also participated in the financing.
Separately, Allianz Re has agreed to enter a multi-year reinsurance agreement with Ledgebrook.
The Boston-based company plans to use the new capital to scale its technology and expand Blackbird, its proprietary AI-native underwriting platform.
Ledgebrook operates in the excess and surplus insurance market and provides general liability, professional liability and specialty coverage for mid-sized businesses through wholesale brokers.
Blackbird is designed to read insurance submissions, classify risks and calculate technical pricing. The platform can quote specialty risks in hours rather than weeks, while experienced underwriters retain responsibility for final underwriting decisions.
Ledgebrook is on track to surpass $1 billion in cumulative premium written since it began writing business in 2023.
The investment also expands Allianz X’s U.S. property and casualty platform into mid-sized general liability risks within the E&S market.
Ledgebrook plans to continue investing in technology and talent as it scales its specialty underwriting business.
KEY QUOTES:
“Our vision is for Ledgebrook to be the company that makes the wheels of insurance spin faster. Businesses with complex risk deserve specialized underwriting, rated with rigor and delivered at speed. Our platform lets our underwriters do that with real discipline. Allianz X backing gives us the capital to keep investing in technology and talent. We’re building this company for the long term.”
Gage Caligaris, Founder and CEO of Ledgebrook
“The industry is applying AI to its simplest risks first, because that is where automation comes easily. We think the larger prize sits at the other end, in complex, hard to place business, where underwriting judgment is scarce and slow decisions cost the most. That’s exactly the gap Blackbird is built to close, and it’s why Ledgebrook fills a meaningful space in our U.S. P&C platform.”
Dr. Nazim Cetin, CEO of Allianz X
“E&S is seeing strong multi-year growth. Admitted carriers tightened their appetite and pushed risks that were once routinely placed in the admitted market into this channel, and we’re excited about accelerating the delivery of value to our distribution partners and insured customers in this segment.”
John Mullen, President of E&S at Ledgebrook

